Front cover of Olivetti Programma 101 General Reference ManaulClick on
cover to see a complete scan of the manual.Manual scan courtesy of Dave Dunfield.

The Olivetti Programma 101, introduced in late '65, was a watershed machine,
being the first highly-successful, stored-program desktop programmable
calculator. Earlier machines such as the
Mathatronics Mathatron
easily beat the Programma 101 to the marketplace, but the 101's ease of use,
beautiful industrial design, built-in magnetic card writer/reader, and
high-speed printer, made the machine a market beater, grabbing
the vast majority of market share in its class until the introduction of the
HP-9100A in 1968. See the Old Calculator Web Museum exhibit on the Olivetti Programma 101 for
more information.